In one minute, you can detect how much real protein is contained in milk; in less than five minutes, you can detect whether the content of pathogenic bacteria in food exceeds the safe "warning line"! Yesterday afternoon, at the Hefei Intelligent Machinery Research Institute of the Chinese Academy of Sciences The reporter saw two brothers, the "Milk Protein Analyzer" and the "Fast Food Safety Detector" that just came out. The researchers said that do n’t look at their simple appearance and small size. In the future, they will work together in the field of food safety. Endless potential! The result of testing milk "true protein" in one minute The protein content of milk is an important indicator to measure its nutritional value, and the protein content of milk is also divided into "true protein" and "false protein". "At present, the national standard for the determination of protein content in milk is the 'Kjeldahl method.' This method cannot directly detect the protein content in milk, but instead estimates the protein content by measuring the total nitrogen content. Such non-protein components cause loopholes in which the protein content is falsely high. "Yu Daoyang, Institute of Intelligence, Chinese Academy of Sciences, introduced. He is responsible for the key project and developed a portable and rapid detection instrument for milk protein content based on fluorescence technology. The reporter saw that the small prototype was not as big as an ordinary microwave oven. More than ten milk samples were poured into the cuvette, after adding the fluorescent indicator, the machine was started, and in less than a minute, a "report sheet" about the protein content and whether it met the standard was automatically printed. "The test principle is that the fluorescent indicator is combined with the true protein in the liquid to generate strong fluorescence under the excitation of light. The test results are not disturbed by nitrogen-containing substances such as melamine and urea, and can pass the strength of the fluorescent signal. Introduce the content of real protein. "Yu Daoyang said that in the future, it can be made into a handheld instrument that can detect 1 or 2 samples at the same time, and families who often drink milk can also prepare one for inspection at any time. It can be determined whether food pathogens exceed the standard within five minutes Is the pathogenic bacteria in a plate of Mapo Tofu exceeding the standard? Use the "Fast Food Safety Detector" to know the result in 5 minutes. Dr. Yang Liangbao introduced in the laboratory of Hefei Institute of Intelligent Machinery, Chinese Academy of Sciences, "The core is not the machine, on the chip that is only one-fifth the size of the fingernail!" Drop a drop of liquid sampled from food on the chip "Little grippers" can quickly "catch" the pathogenic bacteria in the food samples, and the computer display connected to the "food safety rapid detector" will initially give a judgment on whether the food is "safe" within 5 minutes. . At present, this rapid detection instrument can realize the detection of various pathogenic bacteria such as Vibrio parahaemolyticus, Staphylococcus aureus, Salmonella, Listeria, etc. in normal food. Detection of heavy metal ions. "The development cost of the chip is very high, but in the future, such as mass production, the cost will be greatly reduced, a chip is not cheap, and there are more types of pathogenic bacteria that can be detected." Yang Liangbao said. Yangjiang Homelife Industry & Trading Co., Ltd. , https://www.bettyhomelife.com
Chinese Academy of Sciences develops chips to "catch" food pathogens in five minutes